Uh huh...when you open the images in Camera Raw and saved the adjustments, all you saved was Camera Raw metadata (which Preview can't parse). If you want the JPEG images to reflect the parametric adjustments, yes, you must actually process the files and bake those adjustments into the file.

And so I must use image processor, just as I do with Raws, when I want to make psd or tiffs. thanks Jeff.....I wonder does that degrades the jpeg if I start with a jpeg, change look in ACR and then use image processor to make 10 quality jpegs?